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    <title>Document</title>
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<body>
    <script>
        //封装一个数学对象，里面有pI，求数组的最大值和最小值
        let myMath = {
            PI:3.14,
            getMax:function (arr) {
                let max = arr[0];
                for (let index in arr) {
                    if(arr[index] > max) {
                        max = arr[index];
                    }
                }
                return max
            },

            getMin:function (arr) {
                let min=arr[0];
                for (let index in arr) {
                    if (arr [index] <min ) {
                        min = arr[index]
                    }
                }
                return min;
            }

           
        }

        console.log(myMath.PI);
        let arr = [2,12,5,3];
        console.log(myMath.getMax(arr));
        console.log(myMath.getMin(arr));



        
    </script>
</body>
</html>